An E2F1-Mediated DNA Damage Response Contributes to the Replication of Human Cytomegalovirus

PLoS Pathogens

Shan Lu¹  Xiaofei E¹  Jonathan Castillo¹  Michelle Debatis¹  Alexander Lagadinos¹  Timothy F. Kowalik²  Mary T. Pickering²  Shixia Wang² 

[1] Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America;Program in Immunology and Virology, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America

关键词: Viral replication;    Fibroblasts;    Small interfering RNAs;    DNA replication;    DNA damage;    Human cytomegalovirus;    Cytomegalovirus infection;    Protein expression;   

DOI  :  10.1371/journal.ppat.1001342

学科分类：生物科学（综合）

来源: Public Library of Science

【 摘 要 】

DNA damage resulting from intrinsic or extrinsic sources activates DNA damage responses (DDRs) centered on protein kinase signaling cascades. The usual consequences of inducing DDRs include the activation of cell cycle checkpoints together with repair of the damaged DNA or induction of apoptosis. Many DNA viruses elicit host DDRs during infection and some viruses require the DDR for efficient replication. However, the mechanism by which DDRs are activated by viral infection is poorly understood. Human cytomegalovirus (HCMV) infection induces a DDR centered on the activation of ataxia telangiectasia mutated (ATM) protein kinase. Here we show that HCMV replication is compromised in cells with inactivated or depleted ATM and that ATM is essential for the host DDR early during infection. Likewise, a downstream target of ATM phosphorylation, H2AX, also contributes to viral replication. The ATM-dependent DDR is detected as discrete, nuclear γH2AX foci early in infection and can be activated by IE proteins. By 24 hpi, γH2AX is observed primarily in HCMV DNA replication compartments. We identified a role for the E2F1 transcription factor in mediating this DDR and viral replication. E2F1, but not E2F2 or E2F3, promotes the accumulation of γH2AX during HCMV infection or IE protein expression. Moreover, E2F1 expression, but not the expression of E2F2 or E2F3, is required for efficient HCMV replication. These results reveal a novel role for E2F1 in mediating an ATM-dependent DDR that contributes to viral replication. Given that E2F activity is often deregulated by infection with DNA viruses, these observations raise the possibility that an E2F1-mediated mechanism of DDR activation may be conserved among DNA viruses.

【 授权许可】

CC BY